1. View the Apache error log
My Apache log file Directory/var/log/httpd/error.log
[Sun Nov 20 21:17:24 2016] [error] Server reached maxclients setting, consider raising the maxclients setting problems
2. Baidu above the problem is because the original is the largest number of Apache Connections.
checked, This is due to the number of concurrent links too many, and then checked the Apache documentation, found that can be modified by the Apache configuration
The maxclients parameter in the/etc/httpd/conf/httpd.conf to Adjust.
And then configure it inside the HTTPD.CONF.
<ifmodule prefork.c>
Startservers 100
Minspareservers 100
Maxspareservers 100
Serverlimit 1024
MaxClients 1024
Maxrequestsperchild 4000
</ifmodule>
3. From this problem learned a lot about the Apache problem, working mode, but my online server switch always error will not dare to switch,
Apache Problem Handling